121100021011 has 4 divisors (see below), whose sum is σ = 123152563800. Its totient is φ = 119047478224.

The previous prime is 121100020889. The next prime is 121100021051. The reversal of 121100021011 is 110120001121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121100021011 - 2²⁵ = 121066466579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121100021051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1026271306 + ... + 1026271423.

It is an arithmetic number, because the mean of its divisors is an integer number (30788140950).

Almost surely, 2^121100021011 is an apocalyptic number.

121100021011 is a deficient number, since it is larger than the sum of its proper divisors (2052542789).

121100021011 is an equidigital number, since it uses as much as digits as its factorization.

121100021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2052542788.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 121100021011 its reverse (110120001121), we get a palindrome (231220022132).

The spelling of 121100021011 in words is "one hundred twenty-one billion, one hundred million, twenty-one thousand, eleven".